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Finding the Fourth Proportional to 509.90, 765.20 and 201.75

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Solution

The fourth proportional to 509.90, 765.20 and 201.75 is: 302.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.90 : 765.20 = 201.75 : x
  2. Step 2: Convert to fraction form
    509.90/765.20 = 201.75/x
  3. Step 3: Cross multiply
    509.90x = 765.20 × 201.75
  4. Step 4: Simplify right side
    509.90x = 154,378.09
  5. Step 5: Solve for x
    x = 154,378.09/509.90
  6. Step 6: Final answer
    x = 302.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.